The main function of a car's rearview mirror is to provide the driver with information about the situation behind and to the side of the vehicle to ensure driving safety. Specifically, its functions include:
1. Rear view monitoring: The rearview mirror can help the driver observe the traffic situation directly behind the vehicle, including oncoming vehicles, pedestrians, bicycles, etc., so as to avoid collisions when reversing or parking.
2. Side view monitoring: The side mirrors on both sides (also called fender mirrors or side reflectors) allow the driver to see the situation on both sides of the vehicle, which is essential for driving operations such as changing lanes, overtaking or parallel parking.
3. Blind spot reduction: Reasonable adjustment of the rearview mirror can reduce the driver's blind spot and improve driving safety.
4. Anti-glare function: Many modern car rearview mirrors have an anti-glare function, which can reduce the interference from the strong lights of the rear vehicles and improve the safety of night driving.
5. Auxiliary functions: The rearview mirrors in some high-end models may also have auxiliary functions such as automatic folding, heating and defrosting, and electric adjustment to further enhance the user experience and safety.
In general, car rearview mirrors are an important tool to ensure that drivers can fully understand the situation around the vehicle and make safe driving decisions.